I tried to install the 4191 drivers on Red Hat 8.0.92 Beta (Phoebe).
If I compiled from the tarball against the suppied kernel source, the make
succeeded. The installation of the binary GLX libraries from the tarball also
worked okay (well, it would, wouldn't it!). However, when I started the X server
it segfaulted at the "load glx" statement. Removing this statement allowed the drivers
to load and the desktop started but without OpenGL acceleration. :-((

I successfully installed the 4191 drivers on a RH 8.0 (Psyche) system against a
2.4.20 kernel, so I think there is an incompatibility between the binary GLX
libraries and the XFree86 shipped with Phoebe.
HTH
-Robin.